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- Question
The organism which obtain their energy from chemicals are designated as
Options- A. prototrophs
- B. chemotrophs
- C. organotrophs
- D. autotrophs
- Correct Answer
- chemotrophs
- 1. A synergistic effect is observed when
Options- A. one organism removes an inhibitory substance for another
- B. one organism produces a growth factor utilized by another
- C. microbial alteration of pH, aw, Eh favours the growth of another
- D. all of the above Discuss
- 2. Pseudomonas pseudoflava can grow as
Options- A. chemo-lithotrophs
- B. chemo-organotrophs
- C. both (a) and (b)
- D. none of these Discuss
- 3. Starvation proteins are produced by a culture during which of the following segments of the growth curve?
Options- A. Lag phase
- B. Exponential phase
- C. Stationary phase
- D. Death phase Discuss
- 4. The term facultative anaerobe refers to an organism that
Options- A. doesn't use oxygen but tolerates it
- B. is killed by oxygen
- C. uses oxygen when present or grows without oxygen when absent
- D. requires less oxygen than is present in air Discuss
- 5. A microbe, which grows at temperatures above 95° C is most likely to be
Options- A. an archaean
- B. a fungus
- C. a protozoan
- D. none of these Discuss
- 6. Organisms such as lactobacilli that have elaborate requirements for specific nutrients i.e. vitamins and other growth promoting substances, are generally called as
Options- A. fastidious hetrotrophs
- B. chemo-lithotrophs
- C. chemotrophs
- D. photo-organotrophs Discuss
- 7. The growth is normally expressed as __________ in turbidimetric measurement
Options- A. cells per ml
- B. cfu/ml
- C. optical density
- D. mg N2 /ml Discuss
- 8. The equation used to obtain bacterial population by binary fission is
Options- A. N = No2n
- B. log N/No = (0.3010) n
- C. log(N/No) = nlog 2
- D. All of these Discuss
- 9. In the exponential phase, the cells and cell mass
Options- A. first increases then decreases
- B. decreases
- C. are constant
- D. double at a constant rate Discuss
- 10. Bacteria and fungi multiply best
Options- A. below 16°C
- B. between 16-38°C
- C. above 38°C
- D. none of these Discuss
Growth and Nutrition of Bacteria problems
Search Results
Correct Answer: all of the above
Correct Answer: both (a) and (b)
Correct Answer: Stationary phase
Correct Answer: uses oxygen when present or grows without oxygen when absent
Correct Answer: an archaean
Correct Answer: fastidious hetrotrophs
Correct Answer: optical density
Correct Answer: All of these
Correct Answer: double at a constant rate
Correct Answer: between 16-38°C
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